In the absence of replies from anyone who's actually heard these speakers, I'd say be very careful about overloading your small room with big speakers. The Studio 60 and Revel F12 should be able to put out some pretty deep, relatively powerful bass, which could muck up that midband purity you're seeking. If the PSB Imagine model you mention is also a large floorstander, I'd think the same goes. Have you thought about monitors? They might be a better match for your room.
-Bob
-Bob